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First find a scrap heap, buy a front end of a car, then build a smoker, cut and weld bits until you are happy, paint it the colour you want then cook on it.
Finally a good use of a VW Bettle, but as John said, why, yes the novelty factor for a while but soon you'll be fed up wishing you'd built something else. If you've got the skills or access google backwoods clone.